linux-kernel - [PATCH RFC v2 27/28] nfsd: add support for NOTIFY4_ADD

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Message-Id: <20250602-dir-deleg-v2-27-a7919700de86@kernel.org>
Date: Mon, 02 Jun 2025 10:02:10 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Alexander Viro <viro@...iv.linux.org.uk>, 
 Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, 
 Chuck Lever <chuck.lever@...cle.com>, 
 Alexander Aring <alex.aring@...il.com>, 
 Trond Myklebust <trondmy@...nel.org>, Anna Schumaker <anna@...nel.org>, 
 Steve French <sfrench@...ba.org>, Paulo Alcantara <pc@...guebit.com>, 
 Ronnie Sahlberg <ronniesahlberg@...il.com>, 
 Shyam Prasad N <sprasad@...rosoft.com>, Tom Talpey <tom@...pey.com>, 
 Bharath SM <bharathsm@...rosoft.com>, NeilBrown <neil@...wn.name>, 
 Olga Kornievskaia <okorniev@...hat.com>, Dai Ngo <Dai.Ngo@...cle.com>, 
 Jonathan Corbet <corbet@....net>, Amir Goldstein <amir73il@...il.com>, 
 Miklos Szeredi <miklos@...redi.hu>
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org, 
 samba-technical@...ts.samba.org, linux-doc@...r.kernel.org, 
 Jeff Layton <jlayton@...nel.org>
Subject: [PATCH RFC v2 27/28] nfsd: add support for NOTIFY4_ADD_ENTRY
 events

Add support for handling NOTIFY4_ADD_ENTRY events. When a notification
comes in, marshall the event to the notify_spool and kick off the
callback.

Signed-off-by: Jeff Layton <jlayton@...nel.org>
---
 fs/nfsd/nfs4proc.c  |  2 +-
 fs/nfsd/nfs4state.c | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 77b6d0363b9f4cfea96f3f1abd3e462fd2a77754..a2996343fa0db33e014731f62aaa4e7c72506a76 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -2292,7 +2292,7 @@ nfsd4_verify(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	return status == nfserr_same ? nfs_ok : status;
 }
 
-#define SUPPORTED_NOTIFY_MASK BIT(NOTIFY4_REMOVE_ENTRY)
+#define SUPPORTED_NOTIFY_MASK BIT(NOTIFY4_REMOVE_ENTRY|NOTIFY4_ADD_ENTRY)
 
 static __be32
 nfsd4_get_dir_delegation(struct svc_rqst *rqstp,
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index a610a90d119a771771cdb60ce3ee4ab3604cb8a3..9dc607e355d5839d80946d4983205c15ece6a71e 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -9697,6 +9697,31 @@ nfsd_handle_dir_event(u32 mask, const struct inode *dir, const void *data,
 			ent->notify_vals.data = p;
 			++nns->nns_idx;
 		}
+		if (mask & FS_CREATE) {
+			static uint32_t notify_add_bitmap = BIT(NOTIFY4_ADD_ENTRY);
+			struct notify4 *ent = &nns->nns_ent[nns->nns_idx];
+			struct notify_add4 na = { };
+			u8 *p = (u8 *)(stream->p);
+
+			if (!(flc->flc_flags & FL_IGN_DIR_CREATE))
+				continue;
+
+			na.nad_new_entry.ne_file.len = name->len;
+			na.nad_new_entry.ne_file.data = (char *)name->name;
+			na.nad_new_entry.ne_attrs.attrmask.count = 1;
+			na.nad_new_entry.ne_attrs.attrmask.element = &zerobm;
+			if (!xdrgen_encode_notify_add4(stream, &na)) {
+				pr_warn("nfsd: unable to marshal notify_add4 to xdr stream\n");
+				continue;
+			}
+
+			/* grab a notify4 in the buffer and set it up */
+			ent->notify_mask.count = 1;
+			ent->notify_mask.element = &notify_add_bitmap;
+			ent->notify_vals.len = (u8 *)stream->p - p;
+			ent->notify_vals.data = p;
+			++nns->nns_idx;
+		}
 
 		if (nns->nns_idx)
 			nfsd4_run_cb_notify(ncn);

-- 
2.49.0